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Old 09-17-2016, 06:51 PM   #1
linkkokiri83   linkkokiri83 is offline
 
Join Date: Jul 2016
Posts: 18
Differences in carb mm

What is the differnce between a 10mm and a 20 mm carb. Upgrading from stock for the 100cc upgrade on my qmb139 engine. Only upgrade im trying, ive went back to stock on everuthing excwpt the 9g sliders, had 8 g rollers stock. The carb is where im playing aroumd now amd looking for tips as well. Stock airbox or open element filter? Proper hose connections for each way as well. There is one hose from stock nox to the vavle cover im not sure what to do with with the small filter.
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Smm jazzie gy6 , from 50 to 100cc
Orange black cdi cable
Purple racing cdi box
20mm carb jets unknown as of now
Open element air filter
Mirror stereo system
Roller weight nd clutch spring unkown
Rider 6 foot 270 pounds



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Old 09-18-2016, 05:14 AM   #2
blueboy5000   blueboy5000 is offline
 
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Join Date: Jul 2011
Location: Connecticut
Posts: 493
Your 139qmb uses a 17 to 19mm Kiehin style carb. Using a bigger 157 style 21mm carb or flat-slide carb does not improve performance, as you must "jet down" a big carb.

Your 100cc (83cc) would prefer a 88 to 90 main jet.
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2011 Roketa MC-23-150

4T 150cc 157 qmj

24mm carb w 115 main jet and paper cone air filter

Manual petcock w Tygon fuel lines

Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust

RED spring clutch

Adjustable CDI (brand unknown, it's blue and red and works great!)

KOSO high performance variator w 12g sliders

Gates Powerlink 835-20-30 belt

GPS verified 65mph on flats.
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